/Engine/Plugins/Experimental/ModularGameplay/Source/ModularGameplay/Public/Components/GameFrameworkComponentManager.h
Adds an extension handler to run on actors of the given class. Returns a handle that will keep the handler "alive" until it is destructed, at which point the delegate is removed
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FComponentRequestHandle](API\Plugins\ModularGameplay\Components\FComponentRequestHandle) > AddExtensionHandler ( const [TSoftClassPtr](API\Runtime\CoreUObject\UObject\TSoftClassPtr)< [AActor](API\Runtime\Engine\GameFramework\AActor) > & ReceiverClass, [FExtensionHandlerDelegate](API\Plugins\ModularGameplay\Components\UGameFrameworkComponentManager\FExtensionHandle-_2) ExtensionHandler )